CVE-2026-17511 Overview
CVE-2026-17511 is an information disclosure vulnerability in the IBM PowerVM Hypervisor partition resource dump interface. The flaw affects firmware levels FW1120.00 through FW1120.01, FW1110.00 through FW1110.31, FW1060.00 through FW1060.81, and FW950.00 through FW950.H3. An authenticated administrator with access to the Hardware Management Console (HMC) or service processor can obtain a limited snapshot of partition processor state. Successful exploitation produces a confidentiality impact on the managed system. The weakness is categorized under CWE-212: Improper Removal of Sensitive Information Before Storage or Transfer.
Critical Impact
An authenticated administrator on the adjacent management network can extract partition processor state data, exposing sensitive runtime information from logical partitions managed by the hypervisor.
Affected Products
- IBM Power Systems E1080, E1180, E1050, E1150, E950, E980 firmware
- IBM Power Systems S1012, S1014, S1022, S1022s, S1024, S1112, S1114, S1122, S1122s, S1124 firmware
- IBM Power Systems L1022, L1024, L1122, L1124, S914, S922, S924, H922, H924 firmware
Discovery Timeline
- 2026-09-24 - CVE-2026-17511 published to the National Vulnerability Database
- 2026-09-30 - Last updated in NVD database
Technical Details for CVE-2026-17511
Vulnerability Analysis
The vulnerability resides in the partition resource dump interface exposed by the PowerVM Hypervisor to the HMC and service processor. The dump interface is intended to return diagnostic data about a logical partition, but it fails to sufficiently scrub sensitive processor state before returning the snapshot. An authenticated administrator can invoke the dump path and receive processor state fragments that should remain internal to the hypervisor. The exposure is limited in scope but still leaks runtime data from the managed system to the management plane.
Root Cause
The root cause maps to CWE-212, where the hypervisor does not fully remove sensitive information from a resource before it is transferred through the dump interface. The partition resource dump path returns processor state content that was not sanitized against the trust boundary between the hypervisor and the HMC or service processor caller.
Attack Vector
Exploitation requires adjacent network access to the HMC or service processor along with high-privilege authenticated credentials. No user interaction is required. Because PowerVM manages multiple logical partitions on the same physical system, the information disclosure crosses a security scope boundary from the hypervisor into the management plane. An administrator who has been granted access to the HMC can obtain partition processor state they would not otherwise be entitled to view.
No verified exploit code is publicly available. See the IBM Support Article for vendor technical details.
Detection Methods for CVE-2026-17511
Indicators of Compromise
- Unexpected or unauthorized partition resource dump operations initiated from the HMC or service processor interface
- HMC audit log entries showing dump collection by administrator accounts outside of scheduled diagnostic windows
- Unusual service processor sessions originating from management network segments not associated with authorized administrators
Detection Strategies
- Review HMC audit logs for dump and resource dump command invocations and correlate against authorized change tickets
- Baseline normal partition dump frequency per administrator account and alert on deviations
- Monitor service processor authentication events for logins from unexpected sources or during off-hours
Monitoring Recommendations
- Forward HMC and service processor audit logs to a centralized SIEM for retention and correlation
- Enable alerting on privileged administrator actions targeting the partition resource dump interface
- Track firmware version inventory across all Power Systems and flag hosts running vulnerable FW950, FW1060, FW1110, or FW1120 levels
How to Mitigate CVE-2026-17511
Immediate Actions Required
- Apply the fixed PowerVM firmware level documented in the IBM Support Article for your Power Systems model
- Audit HMC and service processor administrator accounts and remove unused or over-privileged credentials
- Restrict management network access to the HMC and service processor to a dedicated, segmented VLAN
Patch Information
IBM has published remediation guidance in the IBM Support Article. Administrators should upgrade to the fixed firmware level above FW1120.01, FW1110.31, FW1060.81, or FW950.H3 as applicable to the affected machine type and model.
Workarounds
- Enforce least-privilege role assignments on the HMC so that only required personnel hold dump collection privileges
- Require multi-person approval and change control for partition resource dump operations until firmware is updated
- Isolate the HMC management network from general corporate networks to reduce the adjacent attack surface
# Query current PowerVM firmware level from the HMC
lslic -t sys -m <managed_system_name> -F ecnumber,activated_level,installed_level
# List HMC user accounts and their task roles for privilege review
lshmcusr -F name,taskrole,resourcerole
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
